CVE-2025-4947

Summary

libcurl accidentally skips the certificate verification for QUIC connections when connecting to a host specified as an IP address in the URL. Therefore, it does not detect impostors or man-in-the-middle attacks.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://curl.se/docs/CVE-2025-4947.html ↗

Additional information

• NVD record
• https://curl.se/docs/CVE-2025-4947.htmlPatch
• https://hackerone.com/reports/3150884Patch
• http://www.openwall.com/lists/oss-security/2025/05/28/4Patch
• https://curl.se/docs/CVE-2025-4947.jsonAdvisory